Effect of tantalum on the microstructure stability of PM Ni-base superalloys

Autor:	P.Y. Xing, Changsheng Liu, Jin-Feng Jia, X.K. Li, H.P. Zhang, Yuan-xiang Zhang, Qiuye Sun, J.M. Bai, J.T. Liu
Rok vydání:	2021
Předmět:	Materials science Precipitation (chemistry) Mechanical Engineering Tantalum chemistry.chemical_element Condensed Matter Physics Microstructure Superalloy chemistry Mechanics of Materials Powder metallurgy Phase (matter) Particle General Materials Science Grain boundary Composite material
Zdroj:	Materials Characterization. 179:111326
ISSN:	1044-5803
DOI:	10.1016/j.matchar.2021.111326
Popis:	The effect of Ta on the microstructure stability of powder metallurgy (PM) Ni-base superalloy was examined at standard heat treatment and after long-term thermal exposure. The results reveal that the previous particle boundary structure is eliminated with the addition of Ta. As Ta content increases, the γ' morphology changes from spheres to cuboids and begins to split, which is caused by the increase in the γ/γ' mismatch. Reversal coarsening of γ' particles in Ta-containing alloys are observed during exposure at 750 °C. The main reasons are related to γ/γ' lattice mismatch, elements partitioning and soft impingement. Besides, the increase of Ta content promotes the precipitation of σ phase at grain boundaries and in grains.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::58d8daea5d5e29d7b084e8c3e79decfa https://doi.org/10.1016/j.matchar.2021.111326 Zobrazit plný text záznamu Full Text from ScienceDirect